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Dan, there's a problem you need to fix:  all .py files in the 
core are run thru reindent.py, which, among other things, 
chops invisible trailing whitespace off lines.  Some of your 
new lines in difflib.py and in test_difflib.py do have invisible 
trailing whitespace (especially inside triple-quote strings), and 
test_difflib fails when that junk is removed.

Repairing this is probably just a matter of running reindent.py 
on those files, then generating a new 
test_difflib_expect.html.  Please verify that's all that's 
needed.  If you say it is, I'll do that and check in the result.  
Else we'll have to revert the checkin.